Judge Excludes Causation Expert, Ends Suit Alleging Shampoo Caused Hair Loss

( August 7, 2026, 10:03 AM EDT) -- NEW YORK — A New York federal judge ruled that the process an expert used to reach his conclusion that a woman’s hair loss was caused by an allergic reaction to shampoo was not based on a reliable methodology, excluding his testimony under Federal Rule of Evidence 702 and granting the manufacturer's motion for summary judgment....